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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84bcff51f1d5da40a2ff54586264d0803d78bceae64a4b2e3fb3623b0191e267' 
  AND token = '0PK9aEUO0sN6JxWSLKsLfpubXVxAlARFkEmbNr4gULs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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