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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f19b5eecab01497f03eb2fa239885c15516227a881b53271968e9a6e4d515b9' 
  AND token = 'vkMT1qenkchWvG0FJgC0oSPOa8hpa/8mee7R1+i/rrc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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