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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8483f0c1d68bf43cb58dfdf0c3b542ed6f9ed6e428f0c86c7a29321679a40866' 
  AND token = 'dCHwdWA4MCFzRB3+zg/mo6dbVwfd1jG00bFDfZM1fgw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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