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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce01daa58ba141b9b53edce4cbb4ae288ce329dd02a70a81e74801911a65d7e6' 
  AND token = '+qiJay5pbpOsPPCINk1EDJog6vhbUXO4VCCXym3VbPg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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