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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee11bc14e255ed3bc7a913d118b129e7744361318ed6c00e7132b9f349da12d9' 
  AND token = 'qGhOCjCPbQ1oLi1VIvEZ1EuMoYjLzOupzlVe0TpN8m8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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