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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0cfb541153ca33fec875fe26f03bf9d2a57397730d030d95ed0a8932bdb4fa9' 
  AND token = 'QXbpYjJyTbgDe3Jh6VIHdo8DMpSs+KcYUSvVe1FN7qk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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