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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fae641695f34414da5e69fca9d8b03d3a7190980436b2dd74d0cb4a1dd90098' 
  AND token = 'gh9Ajo+maU1z5P1fSx5rnT+BUvJ/nJsLrpnGol1uWS0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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