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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42d017e81028f8eba808a7d2a873403348f2b69feab8b58b0ea12a423ce09e74' 
  AND token = 'CBhaDt2NAK9WIM2VAiChbigCAiXAw4Emcsguhx4e8nk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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