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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93b552975b53db554d82e439e7b7f31d5d3bb97df52ed27c75e35ff54bab3158' 
  AND token = '+98NEVnlQqtThmID+6KeXfNKU3iRf4u9VkVbXUW6pL8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00067

JSON explain

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