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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84144e71c408680187625c8f6c84e6f912110f560eb0768691aa1ae07c91a91b' 
  AND token = 'BoX1+FEFfWfiTeehU8Vv4fz33Q54Dl4wIaysaGR8d0M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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