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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf025ba80ee1ebb3212e50eeb235c5882e4ac39ea9a30f5d9a5d2c89dd3ef6e1' 
  AND token = 'E8WBxb/sXmrKQCovO29rhhaNcamN3AGJH6WpHgjkVgE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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