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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f68d7e7d675a8b61f040cd5c72477ac959681a5ab1079f4fe93a7a7c5ca0a41d' 
  AND token = 'dNe7BuXGsIQcerEF42OwyU7NP219kwbwmjPeR67VSMU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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