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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e05785dd98ec33c1c201a74ccc5737b17ae84d747ed7081feddd7788032ab913' 
  AND token = 'zzWaIQDt64LoErg//4zPr9puMxYa+h0va70p0AXieiM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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