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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c400e8879b531a754dd300628cd377a3ea8672c281b638e65433d2fbcc65b2dc' 
  AND token = 'Ly23eb86+Jsc3YVH4WpNkR/NqRY+SDaKnCyd1LIuNuw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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