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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09f56ce8ad49115ae44dd556006670917a3988db2b6d44267db8358955963345' 
  AND token = 'vszfuSrcPUbfpCTxQk8wwBAScFerDqwfCSGeC1tf8vw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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