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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41df1c82e7601abf3bd312dc4aeeedfe887273c1b91321e76ec1389ea43e0c3c' 
  AND token = '4yUV58FB61G4WHtIDJL7fA/3BWfszptgjjqghsS0RWA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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