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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '171c94b84013b68f9826a59f3f78ca4d788359afe07e7f1c8504ed0b36158103' 
  AND token = 'EM7vvh0jOz7zppXpjNaHh759r3ZyFcQ6IMcO5lz0ktY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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