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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0704ca4d97d5371adaa8227cfda39a66dd55ede7c09d098b22d92a2325b51278' 
  AND token = '5IZnzqU6FbWXQbXJITU3fjQLdQ5RWv4y8cbkC9JOSSc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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