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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d66eb86836edb6e0472e650bd2e980ec8ea5bf74d871861ff3907562610658c' 
  AND token = 'RP0f567b9QClLxX7/kNsRxYd+W3mUidJNEU/jfyzlL0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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