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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fae7d7204ee8a710a1bdf1484fe00a5257b9049399cb74a29629e442f7fece30' 
  AND token = 'Yapen8qiL4G07NPsc24h5f2KhZgwwysZLRUj2sKFmn4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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