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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62987a31beb662d326d4a4d583490e4548ac96f9b26caa5e398d0e89fd64d844' 
  AND token = 'UFkONvbZW9fK7a+tkLicG8Q2pA7Vrg8/c0iWsjsvu60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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