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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85a0421667bbd4e5578b0180e082c9a2e525cc5589c9c8dec6fab6c7a52771ad' 
  AND token = '7uH80pT7VqRgSZ1WUEliGme1HeZvTbeC9dHPelgvy5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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