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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a02f7a9b8e95a34348f8c2f3c55aa1c18bcff0150c8f3ed1f48a2577fb980749' 
  AND token = 'y9kPH+bTlGTsyBdVSgBispzQITsVgPcBwm0Fnq1zQzE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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