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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65dc971b11d37940655b00ca659746ecc50f7fb406a3d0b5ed452a55dacb54d8' 
  AND token = 'lhA9+hPMHtvrkJ6TKIPh+Cnl9JOE9p05hizrIROUpOo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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