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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b999a8f9a4e65e6f2abe4270a3a98faba1f66740e572ca369a36d6d52e969c10' 
  AND token = 'mSFeqboCzIzxthNJZPGouOpwr7NFOJDWIzM6LQdWbvY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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