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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87e80eb1be60f4aff2e2685c44290d4cac93d3dce2180285de2fab262b8681d0' 
  AND token = 'NNm7LcyNx1WHqdTXmvIjf87551yplZ9ezBqGzAuliM8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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