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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47bce6b6a1233967296a2a0bee2f8504ec40a4f90743cc40fa5b4e0c8167dd03' 
  AND token = 'PA79w2c26WzfkfpVibjTyQIaAwB2+s9EzP9rKuoWpyI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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