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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5023bd8de6c56d0ad064d53325c09c3f52f022cddf32e7addf68d02e9f9a97bc' 
  AND token = '+t88g7/iCH8ZNcKoNWdp7Vx+er6VN6zSD/Yab+yqRaw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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