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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54631590a914c359136516f27825addbc9f7a3ac7fad30231bcb0fb5a1ddbdc7' 
  AND token = '/7OkyUP8JbCb62ICH0wiPgcslQSQn3Bd3h4uKNPh8wI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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