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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'baa387b7a12fe8c6e3c9cde9f097fc0d945a62aab1c269a2a5723f29d28083db' 
  AND token = 'OX+/y92OhtmM44lXD38FANVr4kG+UTO/cSXYO16MIsc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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