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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93a2a679fb730e9242b41191f8d9a81b84ceb03d5c2c24981cd1f98ec666f84b' 
  AND token = 'GJP4dF6hK6klQM8On1Ceaenb9Z6P76dRi1O45kM6geo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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