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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7042add6b144ebc1f0e9b724a16571c7fff4ccf83a078eaaf115a840ee77ec5c' 
  AND token = 'LQ8iercOk5YD8X5Ss5ROct7ibvSPHCTJdWPZkYQowsk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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