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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3989eb1d5c03a15ce21edec6b9dff3454a37c7a40f5ba30dea9ebf0b1d12eab' 
  AND token = 'BNvILDRqPP3BesSNLHHg5KRvbyJp5x39w/TB5HIdtoY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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