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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72bb8c73ec8064e03de3613905444f32f2eb1b881a159c549527bfe07c4494ce' 
  AND token = '5i9kGx4jd/GfbudXdUksiVluc+4hZo7PNB267LtP4Hs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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