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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f313a839abf6431fb3ba9c6f40560c9d2841434b234182cc03590415fb0951d3' 
  AND token = 'PsG92W1VnnJe9kuj4o6OWbji3n6Gy0Kf+wZ+WeXPYko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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