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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '683f3af447a91721b7753acc4d880409a2b01e928bd409f8a3cab4be049c9ac1' 
  AND token = 'QOMi7ZLNetmEq4p+hC22an0sSR+8EEMGeNNm3DNmo1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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