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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81f88e394ceb0d3875fa2005a9b34e79e474373aea7bedfde0e75be9e19f7f37' 
  AND token = 'bBsNa1BW/Cil10m82W8qLp4h2ATN2dYzPcP/z/vkJM0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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