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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb8d21f5114bace3c082184e3195fbf61a54a4f5fbdd597297e9c8807bab26ea' 
  AND token = 'xE4kLIC7hK3Zm9uJPUoMLR/5l8Jb+5ENe+YrNuE7I/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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