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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bf587ddf43936098de50b0aaa8993b49a8e9d3c8d9b3c1541f3d130606b8a11' 
  AND token = 'M1K7wZfKsn86DTYilLZqA0LFZrGhpOl+gGVAG3+cK5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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