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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '688e7e06b3c8008135b4488e7ac8b6e7bcc3881eb5e2d4cf86dc5ba646d26397' 
  AND token = 'EI/uze8+ntugnCV1ja3oJr8RD7OAVVesdp/xUmVBq48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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