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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf7d2da7401fdcfb7de24e29229730a817beeb460693a111efd9ce5ff8f690bd' 
  AND token = 'hixhBz4lbVbJ7bbp3lS9kurDe3L4iGABgIB1WhAC5Vs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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