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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5ac0bb3265965fde0033fe63d138cb5bfae2535b4cce9031874a0e08ed1895f' 
  AND token = 'a1H/O6BBg+Olyw7c07T8U+AzeCmGVLHsshHxrhR5IHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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