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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04040713055c4f2c7a50bbf1ada958ec6c396d68cb094a2d6bbe756dc6f677c3' 
  AND token = '5xEsqTLuUOplm2QVnHX6XDxRBA9AnRybpKave1a4S+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}