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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40c917e16ca917050abd07914fa0c33deaa33008a6943bf87b68abe4bc66fb5e' 
  AND token = 'jsr0p2+3kQWYpyEhjbU7FKzGDrm7d5I/18X0sQQNUog=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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