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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bda0af6f9f62dc62b239c3a388330a8905b95000c64f2f1c5b2ce780b0fa9580' 
  AND token = 'nWzKSbmcpZNkwodWf1muN82v3nfK3gNy3nt7sMosrD8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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