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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e47a7849861d7ad93e10d397225f672c4edadbe777c06288ec8834c32ef4af4' 
  AND token = 'tsoMreAsvQDiC82re0461WNwIiw6g4GA6Y+kYBIOR30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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