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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fa72587d72f2b68ba15515f2314d1189fdb032614e676e4ddc683d340e862c1' 
  AND token = 'w1FXK54yLlyTSbdcC+r38MBNrrk0CYuFGm09hSX1DTg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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