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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d0f62c1d4ef99418925fe4d569e524252df3395e0c36e43d52cda9b8c35e22b' 
  AND token = '9UVU9MzMNsBdGmHv1HKHE+sU4CGTyuSCQ4GoEwa9Ng0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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