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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70e0d4ea51788ec3e46e077f0abf6fddb38be307ac25ff2954074a5ff4cd8756' 
  AND token = 'kRKUdLXKsx8z7BDwFRbVSEQs5CuY9Pzm2TwUr2bk4ho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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