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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26197adde98956a213ac2e86aa81a4fa541a0e23bbb84ece924a004b00cd8afa' 
  AND token = 'EEEfkCRr97VAhg9HIcQG4z8nulRzxlVw1aMQoXkbZb4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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