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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2871c1d2a87d4382f2620e1a5dce0bbf4473c178cd87cca384764b079731704d' 
  AND token = 'XP8sPq5656v+iAaKgWNdwqml3DobTFqlJu2RRn5AQIU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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