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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dee7f4e7c2572e449b4eff699ee48bd80bca4808b77972fe7e92331643274f9b' 
  AND token = '8OoufJW7DkXP9kElRJin6eRGf8gnaQ+0BLNapWCk0Vs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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