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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a287cc8407556253dd1cbd93e3fe2ca33096dbb60dd3109f002c2a6be12d019' 
  AND token = 'Sdmjaz0bzg6pkzo4yU5vMpt5TpbTgCqn31/+a+V/dA8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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