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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2bea80d149a2dc9f7e86450b1cf6dd9766d03a2bd97a117fcad65a3f7d18245' 
  AND token = 'o5RARVywpEDz6rJJqzlX2eSOIF0zRQfNshgtbS2S95k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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