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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91b77951daba5a53e3ac31e4a20abeafdb03dde57c5df16629d72455aa598c45' 
  AND token = '9J3VBhO1jReUK7fXJbKKYs0VI5+2uUoyNhwM39LcVS4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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