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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d33ef0d49fa1bbf9b0bf082bcae39aa1f2c4e7d5e2f26fd72e6f87edbaebffa' 
  AND token = 'D0SeOk7VlmWm0aMTguGH/qBHIVwBZoysAE/YI0py1uE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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