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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1992d0ef251f5dfa3638568eb440c586517cc0cce11dca5f06e1d3f83bb87924' 
  AND token = 'TdvoSLYgQMzCAzOo3iWlU2RIS3yOu4goh7Ta/fmvGj0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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