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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c282be0f332d47e90e7edfd8994426bda87723f6b33069d7fe7bef7666d934e' 
  AND token = '9bIOp4174X1i0PW4wUvf6eVxDxGNcrice9nFo/m7ltY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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