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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0b74fc1f929108add8c675a31997591b4e6e4be6cbd386f22472af99549d496' 
  AND token = '0R9KYXLu0flTwKs66KPqhBQo76Yr5vxyz3Str8J82ro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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