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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1bbce5c23d610e4438dab8e0cff600e78127c0a2da0dd4fd61cccbfb33e2232' 
  AND token = 'm1wjAmIFoU3YPQuLm5xZIY5B3KV63OQhGF45Z3iCZKE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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