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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13ae7ab238a8bc9e93a64474f6aaaa114bdd1ec88a1a92e2a69532af0cb1fcb5' 
  AND token = 'y7utALpNtocEl/2fjv4Y36FqCv1ICBD/egWpvMCUCfc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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